We're going to my sister's house for Christmas (Christmas Eve to Boxing day) and she called me to say that they have introduced a new house rule of no mobile phones being turned on in the house. She has 2 kids (7 and 10) each with a mobile and her husband has an iPad and BlackBerry for work. She says that to try and get some proper family time, phones and tablets must be switched off over Christmas. I understand her point, but think she's being a little extreme. I don't have kids but do have an iPad and iPhone... I told her that I thought her new "house rule" was going a bit far, but she said it is no different than me asking everyone to take their shoes off in my house (which I do). I've been thinking about this for a few days now and it's starting to bug me. Can I just refuse?